Coating for inhibiting glass to glass adherence

Abstract

Cover slips having improved non-stick properties are provided and a method for making such cover slips is described. In one aspect the use of water-based, colloidal alkylpoly(alkoxy)silanes of formula [(R 1 ) x Si(OR 2 ) 4-x , where x=1-3, R 1 is a C 6 -C 24 hydrocarbon (preferably an alkyl hydrocarbon) and R 2 is a C 1 -C 3 hydrocarbon (preferably a C 1 hydrocarbon)] having a particle size in the range of 6-20 nm is described.

1 . A method for making a coated, non-stick glass sheet, said method consisting of the steps:
 preparing a potash, soda, zinc borosilicate glass mixture by combining potash, soda, zinc oxide and silica sand, and mixing same;   melting the batched material to form a glass melt;   forming the glass melt into a continuous glass sheet having a selected length, width and thickness   cooling the continuous sheet to ambient temperature; cutting the cooled continuous glass sheet into individual sheets;   coating the individual glass sheet with a selected colloidal alkylpoly(alkoxy)silane resin having a particle size in the range of 6-20 nm to thereby form a coated, non-stick glass sheet having a surface energy of less than 60 dynes/cm.   
     
     
         2 . The method according to  claim 1 , wherein coating the individual glass sheets means coating using a method selected from the group consisting of roller application, dipping, spraying or misting. 
     
     
         3 . The method according to  claim 1 , wherein coating the individual glass sheet with a selected colloidal alkylpoly(alkoxy)silane resin means coating using an aqueous suspension of colloidal silane particles having the formula (R 1 ) x Si(OR 2 ) 4-x , where x=1-3, R 1  is a C 6 -C 24  hydrocarbon and R 2  is a C 1 -C 3  hydrocarbon and particles in the range of 6-15 nm. 
     
     
         4 . The method according to  claim 3 , wherein R 1  is a C 16 -C 22  alkyl hydrocarbon and R 2  is a C 1  hydrocarbon. 
     
     
         5 . The method according to  claim 1 , wherein coating with a selected colloidal alkylpoly(alkoxy)silane resin means coating with Dow Corning 2-1322. 
     
     
         6 . A method for making a coated, non-stick glass cover slips, said method consisting of the steps:
 preparing a potash, soda, zinc borosilicate glass mixture by combining potash, soda, zinc oxide and silica sand, and mixing same;   melting the batched material to form a glass melt;   forming the glass melt into a continuous glass sheet having a selected length, width and thickness   cooling the continuous sheet to a temperature in the range of 70-180° C. ambient temperature;   coating the continuous glass sheet with a selected colloidal alkylpoly(alkoxy)silane resin having a particle size in the range of 6-20 nm, while maintaining the temperature of the continuous glass sheet in the range of 70-180° C., to thereby form a coated, non-stick continuous glass sheet having a surface energy of less than 60 dynes/cm;   cooling the coated continuous glass sheet to ambient temperature;   cutting the cooled coated continuous glass sheet into individual sheets; and   cutting the individual glass sheets into individual cover slips of selected of selected length and width and thickness in the range of 0.076 mm to 0.60 mm.   
     
     
         7 . The method according to  claim 6 , wherein coating the individual glass sheet with a selected alkylpoly(alkoxy)silane resin means coating using an aqueous suspension of a colloidal silane resin having the formula (R 1 ) x Si(OR 2 ) 4-x , where x=1-3, R 1  is a C 6 -C 24  hydrocarbon and R 2  is a C 1 -C 3  hydrocarbon and particles in the range of 6-15 nm. 
     
     
         8 . The method according to  claim 7 , wherein R 1  is a C 16 -C 22  alkyl hydrocarbon and R 2  is a C 1 -C 2  alkyl hydrocarbon. 
     
     
         9 . The method according to  claim 6 , wherein coating with a selected colloidal alkylpoly(alkoxy)silane resin means coating with Dow Corning 2-1322. 
     
     
         10 . A no-stick cover slip, said cover slip consisting of potash, soda, zinc borosilicate glass substrate having a coating of a selected alkylpoly(alkoxy)silane containing colloidal particles of said silane therein, said silane have the formula (R 1 ) x Si(OR 2 ) 4-x , where x=1-3, R 1  is a C 6 -C 24  hydrocarbon and R 2  is a C 1 -C 3  hydrocarbon; and particles in the range of 6-15 nm; said coated cover slip having a surface energy of less than 60 dynes/cm. 
     
     
         11 . The cover slip according to  claim 9 , wherein said cover slip coating is DC2-1322. 
     
     
         12 . The cover slip according to  claim 10 , wherein said cover slip has a length and a width and a thickness in the range of 0.076 mm to 0.60 mm.